The various papers so far suggest an old malaria drug, and a general antibacterial work best at minimising the symptoms.

HCQ/ Hydroxychloroquine/ Plaquenil is the old malaria drug also currently used for some form of arthritis seems the best.
This was the one that those Qld scientists were trying to get money before, despite it already having been used in China, and in French studies, and also seemingly in Australia

Other from the French study is athrimozine, a anti-bacterial.

But note these are not a cure, just minimise the symptoms and lower the mortality rate.